Jim, The last correspondence that I saw in this forum basically said that since EN55022 is product specific, it takes precedence over the Generic Emissions standard. Therefore, you are allowed to restrict your equipment's sale and use to commercial applications and qualify Class A.
I have attached that e-mail for your convenience. While we are not doing this right now, I am qualifying a Class A option that has no place in a residential application and will probably use this approach shortly. Regards, Tony Fredriksson [email protected] **************************************************************************** *************** >From James Cunningham: I seem to remember having said all of this on my message of 13 March there still appears to be confusion. As I said (and Ron Fotino just said in his message): ITE: Use EN 55022: 1994 as a product standard giving you the flexibility of Class A or B depending on the product (read the standard!) Apparatus other than ITE: Unless a specific product standard exists, use the generic standard which, for residential, commercial and light industrial equipment, forces you to use the Class B limits. For heavy industrial equipment, you are required to meet the specified limits from EN 55011. It is simple really. James Cunningham Radio Frequency Investigation Ltd Ewhurst Park, Ramsdell Basingstoke Hampshire RG26 5RQ England Tel: (+44) 01256 851193 **************************************************************************** ********** ---------- From: Jim Lyons To: emc-pstc Subject: Class A or Class B for ITE ? List-Post: [email protected] Date: Monday, April 15, 1996 5:15PM I would be interested in knowing if manufacturers of point-of-sale terminals, or other ITE used in a commercial environment, are certifying to EN55022 Class A or Class B. Many of the articles I read state that Class B is required for residential, commercial and light industrial environments, and the Class A is only for heavy industrial areas. The EN50081-1 Generic Emissions Standard encompasses those three environments. There is no such grouping, however, in EN55022 which is the specific EMI standard for Information Technology Equipment. The EN55022 standard states that Class A equipment should not be restricted in its sale. Following are some paragraphs out of EN55022:1995 relating to Class A and Class B: _________________________________________________________________ "Class B ITE is intended primarily for use in the domestic environment and may include: - equipment with no fixed place of use; for example, portable equipment powered by built-in batteries; - telecommunication terminal equipment powered by the telecommunication network; - personal computers and auxiliary connected equipment. NOTE - The domestic environment is an environment where the use of broadcast radio and television receivers may be expected within a distance of 10 m of the apparatus concerned." - - - - - - "Class A ITE is a category of all other ITE which satisfies the Class A ITE limits but not the Class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: Warning This is a Class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures." ___________________________________________________________________ Based on many years and thousands of Class A terminals operating in Europe, I have seen no evidence of interference caused by using these terminals in a commercial establishment. Also, two UK EMC Competent Bodies have stated, in writing, that the terminals should be tested to EN55022 Class A to meet the requirements of the EMC Directive. I have also had an Irish National Test Lab say that Class B is a "recommendation". Bottom line is that, be it Class A or Class B, if the equipment interferes it will have to be remedied. Your comments and/or discussion would be appreciated. Jim Lyons Manager - Product Compliance GTECH Corp.
